Engineering tools
Spring Rate Calculator
How to use this calculatorCalculates spring rate and key design checks for compression, extension and torsion springs from standard geometry and material inputs. Select the spring type below — wire diameter, coil diameter, number of active coils and material shear/elastic modulus drive the calculation in each case.
Need help with a specific spring design or production run? Get in touch and we'll work through it with you.
Free to use, provided as-is. This calculator is offered free of charge with no warranty or guarantee of accuracy, fitness for purpose, or suitability for any specific application. It is an engineering aid, not a substitute for qualified judgement, proper validation, or your own design and quality processes. AbarTech Ltd accepts no liability for outcomes arising from its use. Results are estimates only and must be independently verified before being relied upon.
Compression Spring Inputs
Optional — Deflection & Stress Check
Extension Spring Inputs
Optional — Initial Tension & Stress Check
Torsion Spring Inputs
Optional — Applied Moment & Stress Check
Results
Spring Rate
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Stress
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Deflection
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Index & Geometry
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Formula:
Selecting a material auto-fills typical modulus and allowable stress values for medium wire sizes — always confirm against your actual wire size, temper and supplier datasheet for a real design, as both vary with wire diameter.
Provided free, as-is, with no guarantee of accuracy. Spring index (D/d) below 4 or above 12 indicates a geometry that may be difficult to manufacture reliably — review the design if you see this flagged.
Selecting a material auto-fills typical modulus and allowable stress values for medium wire sizes — always confirm against your actual wire size, temper and supplier datasheet for a real design, as both vary with wire diameter.
Provided free, as-is, with no guarantee of accuracy. Spring index (D/d) below 4 or above 12 indicates a geometry that may be difficult to manufacture reliably — review the design if you see this flagged.